65731940961 has 4 divisors (see below), whose sum is σ = 87642587952. Its totient is φ = 43821293972.

The previous prime is 65731940881. The next prime is 65731941001. The reversal of 65731940961 is 16904913756.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65731940961 - 2¹¹ = 65731938913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65731940161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10955323491 + ... + 10955323496.

It is an arithmetic number, because the mean of its divisors is an integer number (21910646988).

Almost surely, 2^65731940961 is an apocalyptic number.

It is an amenable number.

65731940961 is a deficient number, since it is larger than the sum of its proper divisors (21910646991).

65731940961 is a wasteful number, since it uses less digits than its factorization.

65731940961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21910646990.

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 65731940961 in words is "sixty-five billion, seven hundred thirty-one million, nine hundred forty thousand, nine hundred sixty-one".